This firmware is only for D90 MQA version. This firmware add 32bit support to D90 MQA version at USB input. If firmware of your D90 MQA version already V1.24, then you needn't do this update. Standard version of D90 already support 32bit at USB input so you needn't do this update either.
Please noted that standard version D90 is not able to add MQA support by this firmware, flasing this firmware to standard version of D90 may caused irreversible damage. So if your D90 is a standard version, please DO NOT try this firmware.
Firmware and tools for Windows: Download here (Firmware and tools for Windows: Download here (This update requires a Windows 10 or higher OS with driver installed. Drivers could be download here).
Firmware and tools for MAC: Download here
If you have questions about the upgrade of your D90 MQA version, please contact us before updating this firmware.